Support command line options.
Use vapi for Config namespace.
CMake: configure_file use @ONLY

Don't replace ${foobar} strings which are valid expressions in some shell
files. Only replace @foobar@ occurrences.
CMake: Don't generate C files each time (touch them).
Merge branch 'configvapi' of https://github.com/Lasall/finalterm
Merge branch 'configurefileonly' of https://github.com/Lasall/finalterm

Conflicts:
	CMakeLists.txt
Merge branch 'cmakegenc' of https://github.com/Lasall/finalterm
Minor style adjustments